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Rhenium Electrodeposition and Its Electrochemical Behavior in Molten KF-KBF(4)-B(2)O(3)-KReO(4)

The electrochemical behavior of rhenium ions in the molten KF-KBF(4)-B(2)O(3) salt was systematically studied, and pure metallic rhenium was obtained at the cathode. The processes of rhenium ions reduction and diffusion in molten KF-KBF(4)-B(2)O(3) were determined using cyclic voltammetry, stationar...

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Detalles Bibliográficos
Autores principales: Chernyshev, Aleksandr A., Arkhipov, Stepan P., Apisarov, Alexey P., Shmygalev, Aleksander S., Isakov, Andrey V., Zaikov, Yury P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9738642/
https://www.ncbi.nlm.nih.gov/pubmed/36500174
http://dx.doi.org/10.3390/ma15238679
Descripción
Sumario:The electrochemical behavior of rhenium ions in the molten KF-KBF(4)-B(2)O(3) salt was systematically studied, and pure metallic rhenium was obtained at the cathode. The processes of rhenium ions reduction and diffusion in molten KF-KBF(4)-B(2)O(3) were determined using cyclic voltammetry, stationary galvanostatic and polarization curves analyses. The values of diffusion coefficients were 3.15 × 10(−5) cm(2)/s and 4.61 × 10(−5) cm(2)/s for R(1) and R(2,) respectively. Rhenium electrodeposition was carried out at a constant potential. The process of rhenium cathode reduction in KF-KBF(4)-B(2)O(3) at 773 K was found to be a one-step reaction Re(VII) → Re, and rhenium electrodeposition presumably occurred from two types of complex rhenium ions (KReO(4) and K(3)ReO(5)). Both processes are quasi-reversible and controlled by diffusion. The obtained cathode deposit was analyzed by SEM, EDX, ICP-OES and XRD methods. The obtained deposit had a thread structure and rhenium was the main component.